The Kawai & Teisco Analog Synths Group

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The battery if charged should last about 30 days for the original.
Must be powered on to charge. If after charged your battery is quickly
discharged something is wrong. I used an equivelent radio shack cell
phone rechargable battery and it worked fine. If you modified yours to
take a different battery, that is over my expierence.(of course the
charging voltage will drop once turned off)


















 In kawai_analog@yahoogroups.com, "sputnik979" <sputnik979@...> wrote:
>
> Hi,
> 
> I'm new here so my post might be repetitive but bear with me just a 
> minute;)
> 
> I have tiny experience working with Korgs; Polysix, Poly-61, Poly-
> 800. I know what a non-rechargeable lithium battery is, I know what a 
> rechargeable Ni-Cad battery is, I know the modifications needed to 
> install a lithium in place of an old Ni-Cad, I've resoldered these 
> things many times, so I do have some insight as to these matters.
> 
> I bought my SX-240 in perfect condition - the original battery did 
> not leak. But, being preventive, I decided to replace it with a new 
> one. First I tried a Ni-Mh battery. Then I used a NiCad. Everytime 
> the result was the same: after some days Kawai was losing its memory. 
> 
> Finally I opened it, connected the battery circuit to a volt-meter, 
> and what I found was this: When I switch the synth on, the battery is 
> being charged in a fashion that seems perfectly OK, reaching 3,6V. 
> But the moment I switch the synth off, it starts to fall down very 
> fast. From 3.6V to 3V in the first 30 seconds and then from 3V to 2V 
> in the next couple of minutes. You know what's next...
> 
> What's the matter ? What is killing my batteries ?
> And what battery should I use in the place of the original one? A 
> NiMh or a NiCad ? Does anybody have the battery circuit diagram for 
> SX240 ?
> 
> 
> thanks 
> aero
>